# hook.test -*- tcl -*-
#
#       This file contains the test suite for hook.tcl.
#
# Copyright (C) 2010 by Will Duquette
# Copyright (c) 2019 by Andreas Kupries
#
# See the file "license.terms" for information on usage and 
# redistribution of this file, and for a DISCLAIMER OF ALL 
# WARRANTIES.

#-----------------------------------------------------------------------

source [file join \
	[file dirname [file dirname [file join [pwd] [info script]]]] \
	devtools testutilities.tcl]

testsNeedTcl     8.5
testsNeedTcltest 2.1

support {
}
testing {
    useLocal hook.tcl hook
}

#-----------------------------------------------------------------------
# Helper procs

variable info
array set info {
    callList     {}
    traceList    {}
    errorList    {}
}

proc cleanup {} {
    variable info
    array set info {
        callList  {}
        traceList {}
        errorList {}
    }

    foreach subject [hook bind] {
        hook forget $subject
    }

    hook configure -errorcommand {} -tracecommand {}

    # Ensure that auto-generated observers are repeatable.
    set ::hook::observerCounter 0
}

proc TestBinding {subject hook observer args} {
    variable info

    lappend info(callList) [list $subject $hook $observer $args]

    return
}

proc GetCalls {} {
    variable info

    return $info(callList)
}

proc TraceCommand {subject hook args observers} {
    variable info

    lappend info(traceList) [list $subject $hook $args $observers]
}

proc GetTrace {} {
    variable info

    return $info(traceList)
}

proc TestBind {subject hook observer} {
    hook bind $subject $hook $observer \
        [list TestBinding $subject $hook $observer]
}

proc ErrorCommand {call result opts} {
    variable info

    set opts [dict remove $opts -errorinfo -errorline]

    lappend info(errorList) [list $call $result $opts]
}

proc GetError {} {
    variable info

    return $info(errorList)
}

#-----------------------------------------------------------------------
# cget

test cget-1.1 {unknown option name} -body {
    hook cget -nonesuch
} -returnCodes {
    error
} -result {unknown option "-nonesuch"}

test cget-1.2 {retrieve option value} -body {
    hook cget -errorcommand
} -result {}

#-----------------------------------------------------------------------
# configure

test configure-1.1 {unknown option name} -body {
    hook configure -nonesuch
} -returnCodes {
    error
} -result {unknown option "-nonesuch"}

test configure-1.2 {missing option value} -body {
    hook configure -errorcommand
} -returnCodes {
    error
} -result {value for "-errorcommand" missing}

test configure-2.1 {set values} -body {
    hook configure -errorcommand foo -tracecommand bar

    list [hook cget -errorcommand] [hook cget -tracecommand]
} -cleanup {
    hook configure -errorcommand {} -tracecommand {}
} -result {foo bar}

#-----------------------------------------------------------------------
# bind

test bind-1.1 {too many arguments} -body {
    hook bind a b c d e
} -returnCodes {
    error
} -result "wrong # args: should be \"hook bind ?subject? ?hook? ?observer? ?binding?\""

test bind-2.1 {bindings can be made} -body {
    hook bind S1 <H1> O1 {B1 arg1 arg2}
    hook bind S1 <H1> O1
} -cleanup {
    cleanup
} -result {B1 arg1 arg2}

test bind-2.2 {bindings can be deleted} -body {
    hook bind S1 <H1> O1 {B1 arg1 arg2}
    hook bind S1 <H1> O1 {}
    hook bind S1 <H1> O1
} -cleanup {
    cleanup
} -result {}

test bind-3.1 {bound observers can be queried} -body {
    hook bind S1 <H1> O1 B1
    hook bind S1 <H1> O2 B2
    hook bind S2 <H1> O2 B3

    set a [hook bind S1 <H1>]
    set b [hook bind S2 <H1>]
    set c [hook bind S2 <H2>]

    list $a $b $c
} -cleanup {
    cleanup
} -result {{O1 O2} O2 {}}

test bind-3.2 {bound hooks can be queried} -body {
    hook bind S1 <H1> O1 B1
    hook bind S1 <H2> O2 B2
    hook bind S2 <H3> O2 B3

    set a [hook bind S1]
    set b [hook bind S2]
    set c [hook bind S3]

    list $a $b $c
} -cleanup {
    cleanup
} -result {{<H1> <H2>} <H3> {}}

test bind-3.3 {bound subjects can be queried} -body {
    hook bind S1 <H1> O1 B1
    hook bind S1 <H2> O2 B2
    hook bind S2 <H3> O2 B3

    hook bind
} -cleanup {
    cleanup
} -result {S1 S2}

test bind-3.4 {deleted bindings can no longer be queried} -body {
    hook bind S1 <H1> O1 B1
    hook bind S1 <H1> O2 B2
    hook bind S2 <H1> O2 B3

    hook bind S1 <H1> O2 {}

    set a [hook bind S1 <H1>]
    set b [hook bind S2 <H1>]
    set c [hook bind S2 <H2>]

    list $a $b $c
} -cleanup {
    cleanup
} -result {O1 O2 {}}


test bind-4.1 {auto-generated observer is returned} -body {
    hook bind S1 <H1> "" {B1 arg1 arg2}
} -cleanup {
    cleanup
} -result {::hook::ob1}

test bind-4.2 {auto-generated observer is a real observer} -body {
    set ob [hook bind S1 <H1> "" {B1 arg1 arg2}]
    hook bind S1 <H1> $ob
} -cleanup {
    cleanup
} -result {B1 arg1 arg2}

test bind-4.3 {successive calls get distinct observers} -body {
    set a [hook bind S1 <H1> "" {B1 arg1 arg2}]
    set b [hook bind S1 <H2> "" {B2 arg1 arg2}]
    list $a $b
} -cleanup {
    cleanup
} -result {::hook::ob1 ::hook::ob2}

test bind-5.1 {binding deleted during hook call is not called} -body {
    # If a subject/hook is called, and if a binding deletes some
    # other binding to that same subject/hook, and if the second binding
    # has not yet been called, it should not be called.

    hook bind S1 <H1> O1 {hook bind S1 <H1> O2 ""}
    TestBind S1 <H1> O2
    TestBind S1 <H1> O3
    hook call S1 <H1>

    # Should see O3 but not O2.
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O3 {}}}

test bind-5.2 {binding revised during hook call is called} -body {
    # If a subject/hook is called, and if a binding changes some
    # other observer's binding to that same subject/hook, and if the 
    # other observer's binding has not yet been called, it is the
    # changed binding that will be called.

    hook bind S1 <H1> O1 {TestBind S1 <H1> O2}
    hook bind S1 <H1> O2 {error "Rebind Failed"}

    hook call S1 <H1>

    # Should see O2 in result, instead of getting "Rebind Failed" error.
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O2 {}}}

test bind-5.3 {binding added during hook call is not called} -body {
    # If a subject/hook is called, and a binding adds a new binding
    # for a new observer for this same subject/hook, the new binding
    # will not be called this time around.

    hook bind S1 <H1> O1 {TestBind S1 <H1> O3}
    TestBind S1 <H1> O2

    hook call S1 <H1>

    # Should see O2 in result, but not O3
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O2 {}}}


#-----------------------------------------------------------------------
# forget

test forget-1.1 {can forget safely when not yet initialized} -body {
    hook forget NONESUCH
} -result {}

test forget-1.2 {can forget unbound entity safely} -body {
    hook bind S1 <H1> O1 B1
    hook forget NONESUCH
    hook bind S1 <H1> O1
} -cleanup {
    cleanup
} -result {B1}

test forget-1.3 {can forget subject} -body {
    hook bind S1 <H1> O1 B1
    hook bind S2 <H2> O2 B2
    hook bind S3 <H3> O3 B3
    
    hook forget S2
    hook bind
} -cleanup {
    cleanup
} -result {S1 S3}

test forget-1.4 {can forget subject} -body {
    hook bind S1 <H1> O1 B1
    hook bind S2 <H2> O2 B2
    hook bind S3 <H3> O3 B3
    
    hook forget O2
    hook bind S2 <H2>
} -cleanup {
    cleanup
} -result {}

test forget-2.1 {observer forgotten during hook call is not called} -body {
    # If an observer has a binding to a particular subject/hook, and if
    # in a call to that subject/hook the observer is forgotten, and
    # if that observer's binding has not yet been called, it should not
    # be called.

    hook bind S1 <H1> O1 {hook forget O2}
    TestBind S1 <H1> O2
    TestBind S1 <H1> O3

    hook call S1 <H1>

    # Should get O3 but not O2
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O3 {}}}

test forget-2.2 {subject forgotten during hook call, no more calls} -body {
    # If a subject/hook is called, and some binding forgets the subject,
    # no uncalled bindings for that subject/hook should be called.

    TestBind S1 <H1> O1
    hook bind S1 <H1> O2 {hook forget S1}
    TestBind S1 <H1> O3

    hook call S1 <H1>

    # Should get O1 but not O3
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O1 {}}}



#-----------------------------------------------------------------------
# call

test call-1.1 {can call safely before anything is bound} -body {
    hook call S1 <H1>
} -result {}

test call-1.2 {can call safely when hook isn't bound} -body {
    hook bind S1 <H1> O1 B1
    hook call S2 <H2>
} -cleanup {
    cleanup
} -result {}

test call-1.3 {bindings are executed} -body {
    TestBind S1 <H1> O1
    hook call S1 <H1>
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O1 {}}}

test call-1.4 {multiple bindings are executed} -body {
    TestBind S1 <H1> O1
    TestBind S1 <H1> O2
    hook call S1 <H1>
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O1 {}} {S1 <H1> O2 {}}}

test call-1.5 {only relevant bindings are executed} -body {
    TestBind S1 <H1> O1
    TestBind S2 <H1> O2
    hook call S1 <H1>
    GetCalls
} -cleanup {
    cleanup
} -result {{S1 <H1> O1 {}}}

test call-2.1 {errors propagate normally} -body {
    hook bind S1 <H1> O1 {error "Simulated Error"}
    hook call S1 <H1>
} -returnCodes {
    error
} -cleanup {
    cleanup
} -result {Simulated Error}

test call-2.2 {other exceptions propagate normally} -body {
    hook bind S1 <H1> O1 {return -code break "Simulated Break"}
    hook call S1 <H1>
} -returnCodes {
    break
} -cleanup {
    cleanup
} -result {Simulated Break}


#-----------------------------------------------------------------------
# -errorcommand

test errorerror-1.1 {error with -errorcommand {}} -body {
    hook bind S1 <H1> O1 {error "simulated error"}
    hook call S1 <H1>
} -returnCodes {
    error
} -cleanup {
    cleanup
} -result {simulated error}

test errorcommand-1.2 {error with -errorcommand set} -body {
    hook configure -errorcommand ErrorCommand

    hook bind S1 <H1> O1 {error "simulated error"}
    hook call S1 <H1>
    GetError
} -cleanup {
    cleanup
} -result [tcltest::byConstraint {
    tcl8.6.10plus {{{S1 <H1> {} O1} {simulated error} {-code 1 -level 0 -errorstack {INNER {error {simulated error}} UP 1 CALL {::hook::call S1 <H1>}} -errorcode NONE}}}
    tcl8.6not10   {{{S1 <H1> {} O1} {simulated error} {-code 1 -level 0 -errorstack {INNER {error {simulated error}} UP 1 CALL {call S1 <H1>}} -errorcode NONE}}}
    tcl8.5minus   {{{S1 <H1> {} O1} {simulated error} {-code 1 -level 0 -errorcode NONE}}}
}]

test errorcommand-1.3 {handled errors don't break sequence of calls} -body {
    hook configure -errorcommand ErrorCommand

    TestBind  S1 <H1> O1
    hook bind S1 <H1> O2 {error "simulated error"}
    TestBind  S1 <H1> O3
    hook call S1 <H1>
    list [GetCalls] [GetError]
} -cleanup {
    cleanup
} -result [tcltest::byConstraint {
    tcl8.6.10plus {{{S1 <H1> O1 {}} {S1 <H1> O3 {}}} {{{S1 <H1> {} O2} {simulated error} {-code 1 -level 0 -errorstack {INNER {error {simulated error}} UP 1 CALL {::hook::call S1 <H1>}} -errorcode NONE}}}}
    tcl8.6not10   {{{S1 <H1> O1 {}} {S1 <H1> O3 {}}} {{{S1 <H1> {} O2} {simulated error} {-code 1 -level 0 -errorstack {INNER {error {simulated error}} UP 1 CALL {call S1 <H1>}} -errorcode NONE}}}}
    tcl8.5minus   {{{S1 <H1> O1 {}} {S1 <H1> O3 {}}} {{{S1 <H1> {} O2} {simulated error} {-code 1 -level 0 -errorcode NONE}}}}
}]

test errorcommand-1.4 {-errorcommand handles other exceptions} -body {
    hook configure -errorcommand ErrorCommand

    hook bind S1 <H1> O1 {return -code break "simulated break"}
    hook call S1 <H1>
    GetError
} -cleanup {
    cleanup
} -result {{{S1 <H1> {} O1} {simulated break} {-code 3 -level 1}}}

#-----------------------------------------------------------------------
# -tracecommand

test tracecommand-1.1 {-tracecommand is called} -body {
    TestBind S1 <H1> O1
    TestBind S1 <H1> O2
    TestBind S2 <H2> O2

    hook configure -tracecommand TraceCommand
    hook call S1 <H1>
    hook call S2 <H2>
    hook call S3 <H3>
    GetTrace
} -cleanup {
    cleanup
} -result {{S1 <H1> {} {O1 O2}} {S2 <H2> {} O2} {S3 <H3> {} {}}}

#-----------------------------------------------------------------------
# Clean up and finish

::tcltest::cleanupTests
return
